After a physical, the doctor declares Fred Sanford a "healthy 67-year-old." On the day of the episode's airing in 1975, Redd Foxx was 52 years old. His friend Grady, played but Whitman Mayo, could be expected to be about the same age. Mayo was, in fact, 44 at the time.
Although aired during the fourth season, this episode appears on the fifth season DVD set.